Friction-gear.



Um'iiED STATES Ira'i'iiiu'r OFFICE.

CHARLES E. MATH, OF CHICAGO, ILLINOISVASSIGNOBTO WILLIAM H. EINER, F

i CRAZY, NEW YORK.

salomon-asas..

Specification o! Letters Patent.

Patented Apr. 17, 191'?.y

application inea october 1s. 191s serial 1ro. 56,415.

To all whom 'it may cof/wem:

Be it known that l, (humides E. DATH, a citizen of the limited States, residing at Chicago, in the county of Cook and State 5 of Illinois, have invented a. certain new and useful Improvement in Friction-Gears, of which the following is a full, clear, concise, and exact description, .reference being had to the accompanying drawings, forming a 1o part of thisspeciiicatifm.

This invention 'relates to improvements in friction gears.

An object of the invention is to provide a novel arrangement of the anti-friction rollers in. those types of `friction draft gears which employ friction shoes, wedges and anti-frictionirollers between the wedges and shoes and, more particularly, the object of the invention is to. so arrange the anti-fric-V 20 tion rollers as to insure perfect alinement of the shoes and wedge and also to maintain a continuous contact between the coperating friction surfaces of the shoes and shell.

The invention, furthermore, consists in improvements in the parts and devices and in the novel combinations of the parts and devices herein shown, described and claimed.

In the drawingforming a part of thev s ecification, Figure 1 is a longitudinal, sectlonal view of a portion of a friction draft gearshowing my improvement in connection therewith. Fig. is a transverse, sectional view of the improved gear, the section being taken substantially on the line 2-2 of Fig. 1, and Fig. 3 is a detailed perspective view of one of the friction shoes.

In said drawing, 10 denotes a cylindrical friction shell havin an interior friction surface 1.1 with Vwhic coperate a plurality of friction shoes lwl, the latter having exterior cylindrical surfaces coperating with the friction surface 11. Movementof the friction shoes relatively to the friction cylinder 4is resisted bysprings 13 and 14, it

beingunderstood that the latter are mount- V ed within a spring casing vwhich is preferably formed integrally with the shell 10, the 'spring casing having a rear wall against w; iich the springs 13 and 14. bear. A wedge 5o 1. is employed, the same of wedge acting faces 16--16, the number of said faces 16 corresponding to the number` of shoes 12.4 lurality' of anti-friction rollers 17-17 re' interposed between. the

wedge 15 and; the fricton shoes ina manner having a plurality4 hereinafter described. All the parts are held m assembled relation and the springs preferably under an initial compression by means of a liolt 18.

I Ieretofore, in' friction Agears employing 60 :intl-friction: rollers between a wedge and friction shoes, each roller has been in engagement wath a single shoe, the arrangement being auch-that a radius drawn from the axis ofl the gear perpendicular to a wedge fac'eQWoul pass through substantially the conter of the friction shoe. In my arrangement, each anti-friction roller 17 is so located that it bears upon adjacent wedge faces 19-19 of two friction shoes, 70 each friction shoe 12 having two wedge faces 19, tle same being disposed at an angle to each other and located near the longitudinali edges of the friction shoes. Each friction shoe 12 is provided with w75 longitudinally arranged shoulder 20 at the inner edge if each wedge face 19, so that #the rollers 17 will be held in proper position and also the shoes. V

In the drawings, I have shown three fric- 80 tion shoes and a wedge having three wedge faces, so that each'shoe engages slightly lessthan 120(l of the friction surface of the cylinder and tiewedge is turned to an angle about 60 in advance of the position it has 85 heretofore usually occupied. Or, stated in another'manner, a radius drawn from the axis of the `:gear to the center of aeshoe will bisect the :ingle formed by two adjacent wedge faces.: on the wedge, 'instead of said-.90 radius being erpendicular to` a wedge face,

as has hereto ore been customary;

With myuimproved construction,A it will be seen that? eac friction shoe is acted upon by two rollers and pressure is applied there' 95 to from two faces of the wedge, with the re- Suit that the friction shoes will be forced outwardly :nto engagement with the cylindrical surface so as to engage the'latter' over a maximum area and there will be no danger of any shoe remaining` inactive or not being properly actuated. urthermore, ns heretofore described, the proper alinement of the shoes and wedges is-maintained.y

I claim: i 4

1. In a' friction draftgear, the combination with avfriction shell, a wedge and a plurality, of friction shoes co erable therewith, of a plurality of antiriction rollers interposed between said shoes and wedge,

said rollers corres onding in number to the number of shoes@ glie axes lof said rollers extending in afirme, perpendicular to the axis of the gearof said rollers engaging s two shoes. c

2. In a friction draft gear, the combination with a friction shell, a plurality of friction shoes coperable therewith, and a single piece wedge, of a plurality of anti-friction I rollers interposed between said wedge and 4, In a friction draft gear, the combina-` tion with a friction shell, a wed e and a plurality of friction shoes copera le therewith, ofl a plurality of anti-.friction rollers interposed between said shoes andy wedge, the axes of said rollers extending in a plane perpendicular to the axes of the gear, each of said rollers engaging two shoes.

5. In a friction gear, the combination with a cylindrical friction Ishell, of a Wedge haymg a regular polygon cross section at the wedge portion thereof, a plurality of-friction. shoes having cylindrical outer friction surfaces coperating with said shell, the

number lof said shoes equaling the number of sides to said'polygonal cross section of the wedge, and anti-friction rollers interposed 40 between the wed e and shoes the arrangement of shoes, rollers and wedge beingsuch that a radius extending from the axis of the cylinder to the center of a friction shoe will substantially bisect the angle between two adjacent sides of the polygonal section of the wedge and pass between the ends of adjacent rollers.

6. In a friction gear, the combination with a cylindrical friction shell, of a wedge, triangular' shape in cross section and having three wedge faces at an angle of to each other, three friction shoes each of which has a cylindrical surface engagin approximately 120 of the friction sur ace' of the 55 cylinder, and three anti-friction rollers interposed between the wedge and shoes, the arrangement of shoes relatlvelyto the wedge. bein such-that a radius drawn from the axis y 0f e shell perpendicular to one of the .6o wedge faces will pass between the adjacent longitudinal edges of two friction shoes and be substantially perpendicular to the corresponding anti-friction roller,

7. In a friction gear, the combination with a friction cylinder of a plurality of fric- .tion shoes coperab e therewith, a Wedge and a plurality of anti-friction rollers interposed between saidwdge and shoes, the number of Wedge faces on said wedge and. the number-70 of rollers corresponding to the number of friction shoes, each of'said rollers engaging one wedge face on the wedge onone side and two friction shoes on the opposite side.

In witness that I claim the foregoing I 7'5 havehereunto subscribed my name t is 29th 1 day of September, 1915.

' CHARLES E. DATH. 

